To provide a disturbance observer for a two-inertia system in which a state quantity can be estimated accurately even when there is load disturbance, and a speed control device for the two-inertia system employing the same.
A disturbance observer 8 for applying estimated disturbance torque to a state observer 7 in order to estimate a state quantity of a control object 1 of a two-inertia system is configured to determine the estimated disturbance torque by multiplying motor torque by a first transfer function 81, subtracting from a result of the multiplication a value resulting from multiplying a rotating speed of a motor by a second transfer function 82, and filtering a result of the subtraction by a filter 83 of third order or more. The first and second transfer functions 81 and 82 are determined by calculating the disturbance torque backwards from a transfer function of the two-inertia system for determining the motor speed.
MIYAO TAISUKE
TOKUNAGA ATSUSHI
NAKAMURA NOBUMASA
NAKAMURA MASAFUMI
TOSHIBA MITSUBISHI ELEC INC
| JP3244184B2 | 2002-01-07 | |||
| JPH07177778A | 1995-07-14 | |||
| JPH05314446A | 1993-11-26 | |||
| JPH05176580A | 1993-07-13 |